@import url('https://fonts.googleapis.com/css2?family=Sarabun:wght@300;400;600&display=swap');

:root {
    --primary: #4f46e5;
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Sarabun', sans-serif;
    margin: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 800px;
    margin-top: 50px;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

/* ===================== */
/* Tabs */
/* ===================== */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    justify-content: center;
}

.tab-btn {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--text);
    padding: 10px 20px;
    border-radius: 30px;
    cursor: pointer;
    transition: 0.3s;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
}

/* ===================== */
/* Content Box */
/* ===================== */
.content-box {
    background: var(--card);
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

/* ------------------------------------------------ */
/* Base Form Controls */
/* ------------------------------------------------ */
textarea,
input,
select {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #334155;
    background: #0f172a;
    color: white;
    margin-bottom: 15px;
    box-sizing: border-box;
}

/* ===================== */
/* Action Button */
/* ===================== */
.action-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
}

.action-btn:hover {
    opacity: 0.9;
}

/* ===================== */
/* Result Area */
/* ===================== */
.result-area {
    margin-top: 20px;
    padding: 15px;
    background: #334155;
    border-radius: 8px;
    min-height: 50px;
}

/* ===================== */
/* Upload Area */
/* ===================== */
.upload-area {
    border: 2px dashed #475569;
    padding: 30px;
    text-align: center;
    border-radius: 10px;
    cursor: pointer;
    margin-bottom: 20px;
}

.upload-area:hover {
    border-color: var(--primary);
}

#image-preview {
    max-width: 100%;
    max-height: 300px;
    display: block;
    margin: 0 auto 20px;
    border-radius: 10px;
}

.hidden {
    display: none;
}

/* ================================================= */
/* OCR UX IMPROVEMENT (ADD) */
/* ================================================= */
/* [ADD] แยก Source / Target Language ชัดเจน */
.ocr-lang-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

/* [ADD] กล่องแต่ละภาษา */
.ocr-lang-box {
    display: flex;
    flex-direction: column;
}

/* [ADD] เน้น label ให้ชัด */
.ocr-lang-box label {
    font-weight: 600;
    margin-bottom: 6px;
}

/* [ADD] ข้อความอธิบายเล็ก */
.hint-text {
    font-size: 12px;
    color: #94a3b8;
    margin-top: -8px;
}

/* [ADD] รองรับมือถือ */
@media (max-width: 600px) {
    .ocr-lang-row {
        grid-template-columns: 1fr;
    }
}

/* ================================================= */
/* Chat Styling */
/* ================================================= */
.chat-box {
    height: 400px;
    overflow-y: auto;
    border: 1px solid #334155;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    background-color: #0b1120;
}

.msg {
    padding: 12px 18px;
    border-radius: 18px;
    margin-bottom: 12px;
    max-width: 80%;
    line-height: 1.6;
    word-wrap: break-word;
    font-size: 15px;
    position: relative;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.msg.bot {
    background: #334155;
    color: #e2e8f0;
    border-bottom-left-radius: 4px;
    align-self: flex-start;
}

.msg.bot b {
    color: #fbbf24;
    font-weight: 600;
}

.msg.user {
    background: var(--primary);
    color: white;
    margin-left: auto;
    border-bottom-right-radius: 4px;
    text-align: left;
}

/* ===================== */
/* Chat Input */
/* ===================== */
.chat-input-area {
    display: flex;
    gap: 10px;
}

.chat-input-area button {
    width: auto;
    padding: 0 20px;
}

/* ===================== */
/* Tools Bar */
/* ===================== */
.tools-bar {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.tools-bar button {
    background: transparent;
    border: 1px solid #475569;
    color: #94a3b8;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s;
}

.tools-bar button:hover {
    color: var(--primary);
    border-color: var(--primary);
    background: rgba(79, 70, 229, 0.1);
}

/* ===================== */
/* Text Area Container */
/* ===================== */
.text-area-container {
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    padding: 10px;
    margin-bottom: 15px;
}

/* [UNCHANGED] textarea ด้านใน */
.text-area-container textarea {
    border: none;
    margin-bottom: 0;
    resize: vertical;
    min-height: 100px;
}

/* ===================== */
/* Arrow Icon */
/* ===================== */
.arrow-icon {
    cursor: pointer;
    transition: 0.3s;
}

.arrow-icon:hover {
    color: var(--primary);
    transform: rotate(180deg);
}

/* ================================================= */
/* REMOVED / UNUSED (COMMENTED BY DESIGN) */
/* ================================================= */
/*
เดิมไม่มี class สำหรับแยก OCR source/target
จึงไม่ลบอะไรออกเพื่อป้องกัน side-effect
ทุกอย่างที่เพิ่มเป็น additive-only
*/